Rumer Willis Sherman Oaks tank top tattoos no makeup
Beverly Hills Gwen Stefani blonde sunglasses sandals

We caught up with several celebs on Saturday as they picked up last-minute items for their Halloween costumes!

Because Halloween is on Monday, Saturday night was the time to party! Several A-listers hit up Kate Hudson's annual party in Brentwood, while Heidi Klum hosted a big bash in Las Vegas. That party was Klum's 13th annual Halloween soiree -- she'll also host a party on Monday in NYC.

Rumer Willis and Gwen Stefani both rocked casual ensembles as they shopped in Sherman Oaks and Beverly Hills, respectively. Want to know what costumes they wore? Clickhere to see Rumer's and here to see Gwen's!